bug(gulp-traceur@0.14.0): double sourceMaps at the end of the file

[douglasduteil]

Back in the version 0.13.0 there was only one sourceMappingURL at the end of the files.

Contents of the test should generate source maps with the gulp-traceur@0.13.0

"use strict";
[].map((function(v) {
  return v + 1;
}));

//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbImZpeHR1cmUuanMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IkFBQUE7QUFBQSxDQUFDLElBQUksQUFBQyxFQUFDLFNBQUEsQ0FBQTtPQUFLLENBQUEsQ0FBQSxFQUFJLEVBQUE7QUFBQSxFQUFDLENBQUE7QUFBQSIsImZpbGUiOiJmaXh0dXJlLmpzIiwic291cmNlc0NvbnRlbnQiOlsiW10ubWFwKHYgPT4gdiArIDEpIl0sInNvdXJjZVJvb3QiOiIvc291cmNlLyJ9

Is it normal to have two of them in the new version 0.14.0 ?

Contents of the same test should generate source maps with the gulp-traceur@0.14.0

"use strict";
[].map((function(v) {
  return v + 1;
}));

//# sourceMappingURL=fixture.map

//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbImZpeHR1cmUuanMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IkFBQUE7QUFBQSxDQUFDLElBQUksQUFBQyxFQUFDLFNBQUEsQ0FBQTtPQUFLLENBQUEsQ0FBQSxFQUFJLEVBQUE7QUFBQSxFQUFDLENBQUE7QUFBQSIsImZpbGUiOiJmaXh0dXJlLmpzIiwic291cmNlUm9vdCI6Ii9ob21lL3gvdG1wL2d1bHAtdHJhY2V1ci9maXh0dXJlIiwic291cmNlc0NvbnRlbnQiOlsiW10ubWFwKHYgPT4gdiArIDEpIl19

I'm not sure about the use case of this;

// [...]
if (file.sourceMap) {
    fileOptions.sourceMaps = true;
}
// [...]

(extract from https://github.com/sindresorhus/gulp-traceur/blob/v0.14.0/index.js#L25 )

Setting the sourceMaps options to true is actually making traceur process the sourceMaps itself no ? (see https://github.com/google/traceur-compiler/wiki/SourceMaps)